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08-12-2019, 07:31 AM
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Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,643
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PMag Questions
I have two questions for PMag owners:
1) Do you check the generator at run-up every flight or is it just a periodic check? I'll have mine on breakers since it's a retro and I don't want to rework my panel.
2) What are you finding at the 100 hour inspections?
Thanks!
__________________
RV-14A #140376
N196 (Flying)
2019 Bronze Lindy
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08-12-2019, 07:34 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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1. I do the internal generator check maybe twice a year. The pMags are on pull breakers. Don't be surprised if the internal generator works down to 750 RPM or so.
2. 100 hour checks - nothing ever found (1200 hours on the pMags)
Carl
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08-12-2019, 07:41 AM
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Join Date: Sep 2012
Location: 07TS
Posts: 472
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I do the generator every run up. Never had an issue.
100 hour inspection, never found anything. Almost 500 hours.
-Dan
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Dan Weyant
RV-9A N96KD
Done and Flying 4/30/2015
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08-12-2019, 07:59 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by bkervaski
1) Do you check the generator at run-up every flight or is it just a periodic check? I'll have mine on breakers since it's a retro and I don't want to rework my panel.
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Not much point in having a p-mag if you're not sure the internal generator works.
I have found a dead one during a pre-buy.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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08-12-2019, 08:03 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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I perform the generator check before every flight.
I had one fail at around 500 hours and the engine never skipped a beat. The only way I found it was in the preflight for the next flight.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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08-12-2019, 08:13 AM
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Join Date: Nov 2006
Location: West Chester, PA
Posts: 689
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P-Mags on breakers vs VP?
Op brings up a good point. I ran P-Mags on my -9A for many years which had separate panel mounted breakers. In planning my new build I am inclined to retain that configuration vs putting them on the Vertical Power bus for quick access to pre-flight testing . . . any thoughts on this Bill R?
__________________
Mark
RV-9A; Sold 
RV-14A; Building
2020 =VAF= donor
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08-12-2019, 08:19 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by MS19087
Op brings up a good point. I ran P-Mags on my -9A for many years which had separate panel mounted breakers. In planning my new build I am inclined to retain that configuration vs putting them on the Vertical Power bus for quick access to pre-flight testing . . . any thoughts on this Bill R?
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Mark,
You can still run the P-mags through your VP bus and install a three way switch for testing. (I have pullable breakers plus the three way switch. Up is ungrounded and powered, middle is ungrounded and unpowered, and down is unpowered and grounded.)
Here is how I perform my pre-flight check before every flight. It takes longer to read than perform.
Here is an old picture of the panel, the switch placement has remained the same through three iterations and will remain the same as I plan the next panel upgrade.

(You can see I still hadn't cleaned up the wiring when this picture was taken.)
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Last edited by N941WR : 08-12-2019 at 08:23 AM.
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08-12-2019, 12:54 PM
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Join Date: Mar 2014
Location: Granbury, TX
Posts: 268
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I have spring toggle switches (push to open) on PMag power (as well as breakers) and check the internal generators independently at run up on every flight. I?ve never had an internal generator failure in 500 hours.
__________________
Keith Brown
RV-14A Builder - kit #136
N314KC - First flight Mar 8, 2017, 24th in the air, >600 hrs
XP-400 Aero Sport Power, replaced with Lyc Thunderbolt 390
RV-6A sold
Sport Pilot (weight-shift control) - Airborne XT912
Dues paid 9/2020
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08-12-2019, 01:19 PM
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Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,052
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We have dual P-Mags on our 7 - original fit since 2010.
I do a dead mag check every month, we do an inspection at annual when we change the plugs - whooo hoo, $7 a piece at O'Reillys
Only time we had an issue was when someone timed them like dumb mags. Holy carp, that backfire was spectacliar !
Fit 'Em, Fly 'Em, Enjoy 'Em.
Bring on the 6 version into production.

__________________
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q
Donated in 2020
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08-12-2019, 01:24 PM
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Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,039
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I do the generator check on every run up and have never had an issue. Dual P-Mags with individual circuit breakers and normally closed push to test buttons. I also do 100 hour inspections and have never found anything wrong. 450 hours and counting.

__________________
Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
Last edited by GalinHdz : 08-13-2019 at 06:16 AM.
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